Battery Cell, Battery Pack and Vehicle

Abstract

A battery cell (e.g., in a battery pack, or in a vehicle) comprises: a housing having an inner cavity, a first side wall, and a second side wall; a terminal post; an explosion-proof valve; and an electrode core. A first recess and a plurality of second recesses are arranged on an inner wall surface of the second side wall and are concave in a direction facing away from the inner cavity. The first recess forms a main air passage in the inner cavity. The plurality of second recesses form a plurality of branch air passages, separately communicating with the main air passage, in the inner cavity. The second side wall comprises an explosion-proof hole corresponding to a position of the main air passage. The explosion-proof valve is mounted on the second side wall. The electrode core is arranged in the housing and spaced apart from the explosion-proof hole.

1 . A battery cell, comprising:
 a housing, wherein the housing comprises an inner cavity and a first side wall and a second side wall opposite to each other, wherein an inner wall surface of the second side wall is configured with a first recess and a plurality of second recesses, the first recess and the plurality of second recesses are recessed in a direction facing away from the inner cavity, the first recess forms a main gas passage in the inner cavity, the plurality of second recesses form a plurality of branch gas passages in the inner cavity, wherein the plurality of branch gas passages are respectively in communication with the main gas passage, and wherein the second side wall comprises an explosion-proof hole corresponding to a position of the main gas passage;   a terminal post, wherein the terminal post is arranged on a side wall of the housing other than the second side wall;   an explosion-proof valve, wherein the explosion-proof valve is mounted on the second side wall, and wherein the explosion-proof valve is configured to cover the explosion-proof hole; and   an electrode core, wherein the electrode core is arranged in the housing, and wherein the electrode core is spaced apart from the explosion-proof hole.   
     
     
         2 . The battery cell according to  claim 1 , wherein the main gas passage and the plurality of branch gas passages are arranged at least in a length direction of the second side wall, and a dimension of the main gas passage in a width direction of the second side wall is greater than a dimension of each of the plurality of branch gas passages in the width direction of the second side wall. 
     
     
         3 . The battery cell according to  claim 1 , wherein the main gas passage extends along a width direction of the second side wall, each of the plurality of branch gas passages extends along a length direction of the second side wall, and the plurality of branch gas passages are distributed at two sides of the main gas passage in the length direction of the second side wall. 
     
     
         4 . The battery cell according to  claim 1 , wherein the plurality of branch gas passages are arranged at each side of the main gas passage in a length direction of the second side wall, and the plurality of branch gas passages are spaced apart along a width direction of the second side wall;
 an equal number of the plurality of branch gas passages are arranged at two sides of the main gas passage in a length direction of the second side wall; and   the plurality of branch gas passages at the two sides of the main gas passage in the length direction of the second side wall are arranged in a one-to-one correspondence manner.   
     
     
         5 . The battery cell according to  claim 1 , wherein an outer wall surface of the second side wall is configured with a first protrusion, the first protrusion protrudes in a direction facing away from the inner cavity, the first protrusion corresponds to a position of the first recess, and wherein the explosion-proof hole penetrates through the first protrusion and the first recess. 
     
     
         6 . The battery cell according to  claim 5 , wherein the outer wall surface of the second side wall is configured with a plurality of second protrusions, each of the plurality of second protrusions protrudes in a direction facing away from the inner cavity, and the plurality of second protrusions correspond to positions of the plurality of second recesses in a one-to-one correspondence manner. 
     
     
         7 . The battery cell according to  claim 6 , wherein the first protrusion and the first recess are located at a center of the second side wall in a length direction of the second side wall. 
     
     
         8 . The battery cell according to  claim 1 , wherein a depth of the main gas passage ranges from about 0.5 mm to about 3 mm; and
 a depth of each of the plurality of branch gas passages ranges from about 0.5 mm to about 3 mm.   
     
     
         9 . The battery cell according to  claim 1 , further comprising a plurality of electrode cores, wherein the plurality of electrode cores are arranged in sequence, an arrangement direction of the plurality of electrode cores is consistent with a thickness direction of the plurality of electrode cores, and each of the plurality of electrode cores at least corresponds to one branch gas passage of the plurality of branch gas passages. 
     
     
         10 . The battery cell according to  claim 1 , further comprising a plurality of electrode cores, wherein a dimension of the plurality of electrode cores in a length direction of the second side wall is L 1 , and a maximum length of the first recess and the plurality of second recesses on the second side wall is L 2 , and wherein L 1  and L 2  meet: 0.04≤L 2 /L 1 ≤0.96. 
     
     
         11 . The battery cell according to  claim 10 , wherein L 1  and L 2  further meet: L 1 ≤500 mm, and L 2 ≥20 mm. 
     
     
         12 . The battery cell according to  claim 1 , further comprising a plurality of electrode cores, wherein the main gas passage is located at a center of the plurality of electrode cores in a length direction of the second side wall;
 wherein the explosion-proof hole is located at a center of the main gas passage; and   wherein the explosion-proof hole is located at the center of the plurality of electrode cores in a thickness direction of the plurality of electrode cores.   
     
     
         13 . The battery cell according to  claim 1 , further comprising:
 an insulating film, wherein the insulating film is arranged in the inner cavity, and the insulating film is located between at least a part of the inner cavity and the explosion-proof valve.   
     
     
         14 . The battery cell according to  claim 1 , wherein the terminal post comprises a positive electrode terminal post and a negative electrode terminal post, wherein the housing is an aluminum housing, the positive electrode terminal post is electrically connected to the housing, and wherein a difference between a voltage of the positive electrode terminal post and a voltage of the housing is not less than 0 V and not greater than 2.5 V. 
     
     
         15 . The battery cell according to  claim 1 , wherein the terminal post comprises a positive electrode terminal post and a negative electrode terminal post, wherein the housing is a steel housing, the negative electrode terminal post is electrically connected to the housing, and wherein a difference between a voltage of the housing and a voltage of the negative electrode terminal post is not less than 0 V and not greater than 2.5 V. 
     
     
         16 . The battery cell according to  claim 1 , wherein the housing comprises:
 a housing body, wherein the second side wall and the inner cavity are formed on the housing body, the housing body comprises an opening facing the second side wall, and wherein the opening is in communication with the inner cavity; and   a housing cover, wherein the housing cover is mounted to the housing body, the housing cover covers the inner cavity, wherein the first side wall is formed on the housing cover, and wherein the terminal post is connected to the housing cover.   
     
     
         17 . A battery pack, comprising:
 a box; and   a battery cell, wherein the battery cell is mounted in the box, and wherein the battery cell comprises:
 a housing, wherein the housing comprises an inner cavity and a first side wall and a second side wall opposite to each other, wherein an inner wall surface of the second side wall is configured with a first recess and a plurality of second recesses, the first recess and the plurality of second recesses are recessed in a direction facing away from the inner cavity, the first recess forms a main gas passage in the inner cavity, the plurality of second recesses form a plurality of branch gas passages in the inner cavity, wherein the plurality of branch gas passages are respectively in communication with the main gas passage, and wherein the second side wall comprises an explosion-proof hole corresponding to a position of the main gas passage; 
 a terminal post, wherein the terminal post is arranged on a side wall of the housing other than the second side wall; 
 an explosion-proof valve, wherein the explosion-proof valve is mounted on the second side wall, and wherein the explosion-proof valve is configured to cover the explosion-proof hole; and 
 an electrode core, wherein the electrode core is arranged in the housing, and wherein the electrode core is spaced apart from the explosion-proof hole, 
 wherein, the explosion-proof valve faces a bottom wall of the box. 
   
     
     
         18 . A vehicle, wherein the vehicle comprises a battery cell according to comprising:
 a housing, wherein the housing comprises an inner cavity and a first side wall and a second side wall opposite to each other, wherein an inner wall surface of the second side wall is configured with a first recess and a plurality of second recesses, the first recess and the plurality of second recesses are recessed in a direction facing away from the inner cavity, the first recess forms a main gas passage in the inner cavity, the plurality of second recesses form a plurality of branch gas passages in the inner cavity, wherein the plurality of branch gas passages are respectively in communication with the main gas passage, and wherein the second side wall comprises an explosion-proof hole corresponding to a position of the main gas passage;   a terminal post, wherein the terminal post is arranged on a side wall of the housing other than the second side wall;   an explosion-proof valve, wherein the explosion-proof valve is mounted on the second side wall, and wherein the explosion-proof valve is configured to cover the explosion-proof hole; and   an electrode core, wherein the electrode core is arranged in the housing, and wherein the electrode core is spaced apart from the explosion-proof hole,   wherein the first side wall is located above the second side wall.   
     
     
         19 . The battery pack according to  claim 17 , wherein the battery cell further comprises a plurality of electrode cores, wherein the plurality of electrode cores are arranged in sequence, an arrangement direction of the plurality of electrode cores is consistent with a thickness direction of the plurality of electrode cores, and each of the plurality of electrode cores at least corresponds to one branch gas passage of the plurality of branch gas passages. 
     
     
         20 . The vehicle according to  claim 18 , wherein the battery cell further comprises a plurality of electrode cores, wherein the plurality of electrode cores are arranged in sequence, an arrangement direction of the plurality of electrode cores is consistent with a thickness direction of the plurality of electrode cores, and each of the plurality of electrode cores at least corresponds to one branch gas passage of the plurality of branch gas passages.